Celestial Spirit

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Celestial Spirits (星霊 Seirei) ,are magical beings from their own separate universe, the Celestial Spirit World. Mages, called Celestial Spirit mages, are able to summon spirits by opening their gates through the use of Keys.

All Celestial Spirits are named after a different astronomical constellation.

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When a Celestial Spirit Mage receives a Key and opens its Celestial Gate for the first time, they have to set up a contract with the respective spirit. This contract consists of asking the spirit which days it can be summoned by the Mage. This simple agreement, much to the shock of Natsu and Happy, forms a dedicated, serious bond between the Spirit and summoner. However, under certain circumstances, i.e. during battle, a contract can be asked to be completed later.

Contracts can be broken if the Mage gets arrested, releases the spirit by him/her self, or dies. When a Celestial Spirit Mage summons a spirit, it appears directly next to them, as that's where the gates to the Spirit world had been opened. It's impossible to summon spirits elsewhere. The spirits must also abide by certain rules enforced by the Celestial Spirit King. The only rule that has been introduced in Fairy Tail so far is that a spirit may not directly or indirectly kill its summoner under any circumstances.

...The contract can be broken when the summoner dies.

When the gates are closed, it is required from both the summoner and the spirit to agree upon the gate's closure. However, spirits can also be "forced closed" in battle, which means they can be forced back into the Celestial World by the summoner's will, though not every Celestial Spirit Mage is capable of doing that.

Celestial Spirits also have different categories of sorts, that fall under the basic summoning conditions from their owner. For example, Loke summons himself most of the time without Lucy doing so herself, Virgo also has summoned herself once, as have Gemini and Horologium and if trust between the Celestial Spirit and the Owner is not an issue, contracts can be temporarily dissolved. It also seems that if the Celestial Spirit is strong enough, they can use their own Magic to stay in the Human World, when/if the contract is not in action. The strength of the Celestial Spirits is affected by the Magical strength of their summoner as Lucy once said that her spirits could become even stronger than Natsu if she trained more.

Summoner: Lucy Heartfilia, Layla Heartfilia (former), Zoldeo (former)"The Goat" is a humanoid goat who was taken over by his former master through the use of Lost Magic. When he is freed, he joins Lucy as one of her spirits.

Summoner: Lucy Heartfilia, Angel (formerly), Karen Lilica (formerly), Ahatake Kurosaki (formerly)"The Ram" Aries is a timid female. She has horns at the top of her head much like a ram. She has white and fluffy clothes, like a sheep. Her Magic deals with using wool attacks to reassure her opponents in combat.

Summoner: Lucy Heartfilia, Layla Heartfilia (formerly)"The Great Crab" Cancer has a crab-claw hairstyle with six crab legs coming out of his back. He wields a pair of scissors that he uses for attacking and haircuts.

Summoner: Yukino Aguria"The Heavenly Scales" Libra is a young woman in a dancer's outfit who hides her face behind a veil and wears each half of a set of balancing scales on each hand. She has the power to alter gravity.

Summoner: Lucy Heartfilia"The Southern Cross" Crux is a human like cross, with a mustache and cross shaped nose. Crux has a lot of information about all Celestial Spirits and their masters, either in the present or in the past.

Summoner: Lucy Heartfilia"The Harp" Lyra wears a bonnet and dress. She also has wings on her back, she has the ability to sing beautiful songs, she mostly sings about emotions, but she does take requests.

All Celestial Spirits spend their time in the Celestial Spirit World when not called through by their summoners. Being in the World seems to have some sort of rejuvenating effect on the spirits, restoring their health after being in the human world which, over long periods of time, can potentially kill the spirit. The reverse is also possible: humans are unable to breathe in their World so after a period of time, albeit a much shorter one, they would die. Such an occurrence (a human entering the Celestial World) is a serious breach of contract. This rule, however, is not absolute, since Natsu survives an extremely brief period in the Celestial Spirit World when he catches hold of Virgo just as she transits through the spirit world to reappear elsewhere in the human world at Duke Everlue's command.